Agent Harris reveals a personal reason behind her involvement in the investigation: she suspects that her father was using NZT before he was found dead in a river.
Brian begins work with the FBI, only to be stuck behind a desk as an analyst while they monitor his use of NZT, since they are unaware he is using the enzyme to counter the side effects.
Also, Brian accidentally meddles in Rebecca's personal life while learning self-defense from her secret boyfriend, FBI Agent Casey Rooks (who incidentally does not know about NZT) by making him suspicious about how Brian was able to pick up self-defense technique so quickly.
After Brian tells Rebecca about the file, they start digging deeper into her father's involvement with NZT.
Finally, Morra gives Brian the shot and five extra NZT pills.
He explains he was testing his moral compass, and whether he is "somebody who just takes orders like Sands, or if he is somebody who has character".
With the mysterious US Senator Eddie Morra (Bradley Cooper) providing him with an immunity shot to counteract NZT's deadly side effects, Brian uses his enhanced abilities to help FBI agent Rebecca Harris (Jennifer Carpenter).Sands, however, wants Rebecca gone and attempts to blackmail Brian by withholding the immunity shot, into framing her so she loses her job at the FBI.Brian hopes that whoever created NZT might be able to provide him with a way to counteract the side effects.His friend Eli offers him a pill of NZT, which helps Brian excel in his temp job and discover the true nature of his father's disease.When Brian finds Eli dead from a gunshot, he becomes the main suspect in an FBI murder investigation.